title: [Importance of the parameters of temperature and natural light on stability of 2 types of L(+) lactate:cytochrome oxidoreductases (cytochromes b2) extracted from Hansenula anomala yeast].
abstract: In this communication, we present the effect of two parameters, temperature and daylight-at high ionic strength-on the stability of H-flavocytochrome b2 solutions prepared using [H-flavocytochrome b2 (S) or not [H-flavocytochrome b2 (n) n-butanol during extraction. These two enzyme preparations presented the same behaviour towards these two parameters: in the dark, temperature was critical; in daylight, an opposite effect was observed for this parameter: the stability of samples was smaller at 0 degrees C. However, the evolution of life of the classical kinetic parameters (Km and Vm) of the enzymatic reaction is presented for three samples of H-flavocytochrome b2 (n) or (s) exposed to daylight at 20 +/- 0,1 degrees C.
mesh_terms: D001203:Ascomycota / Q000201:enzymology*; D004355:Drug Stability; D007700:Kinetics; D007770:L-Lactate Dehydrogenase / Q000378:metabolism*; D042844:L-Lactate Dehydrogenase (Cytochrome); D008027:Light; D009994:Osmolar Concentration; D010843:Pichia / Q000201:enzymology*; D013696:Temperature
chemical_list: D007770:L-Lactate Dehydrogenase; D042844:L-Lactate Dehydrogenase (Cytochrome)
vernacular_title: Etude de l'importance des paramètres température et lumière naturelle sur la stabilité de deux types de L(+) lactate : cytochrome c oxydoréductases (cytochromes b2) extraites de la levure Hansenula anomala.